Laser Additive Manufacturing Process Development for Bismuth Telluride Thermoelectric Material
Laser Additive Manufacturing Process Development for Bismuth Telluride Thermoelectric Material
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DOI：
10.1007/s11665-022-07084-w
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发表时间：
2022-06
影响因子：
2.3
通讯作者：
Haidong Zhang;S. LeBlanc
中科院分区：
文献类型：
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作者：
Haidong Zhang;S. LeBlanc
热电发电机在航空航天和飞机应用方面具有很大的潜力。然而，热电装置的传统制造方法严重限制了装置的适应性，并因此限制了市场。激光粉末床熔融是一种增材制造方法，在生产热电器件方面具有很大的潜力。与金属相比，热电材料由于低导热性、脆性断裂特性和不规则的粉末颗粒形态而提出了独特的挑战。介绍了激光粉末床熔融法制备Bi2Te3热电元件的工艺过程。我们确定了关键工艺参数的成功组合-激光功率，扫描速度，孵化距离和粉末层厚度-以实现高质量的零件密度和物理性能，我们证明了工艺参数变化对构建零件质量的影响。虽然它不能完全确定零件质量，但体积能量密度是决定热电材料工艺参数的有用指南，对于Bi2Te3，最佳值为9至11 J/mm3。我们展示了不同的自由几何形状的Bi2Te3粉末的成功制造。结果表明，这种方法可以更广泛地扩展到其他半导体材料，包括适用于空间应用的热电发电材料。
Thermoelectric generators have strong potential for aerospace and aircraft applications. However, traditional manufacturing methods for thermoelectric devices severely limit device adaptability and consequently marketability. Laser powder bed fusion is an additive manufacturing method which shows promising potential for producing thermoelectric devices. Thermoelectric materials pose unique challenges compared to metals because of low thermal conductivity, brittle fracture characteristics, and irregular powder particle morphologies. Herein, we communicate processing procedures to fabricate thermoelectric parts of Bi2Te3through laser powder bed fusion. We identify the successful combination of key process parameters—laser power, scan speed, hatch distance, and powder layer thickness—to achieve high-quality parts in terms of density and physical properties, and we demonstrate the impact of process parameter variation on built part quality. While it cannot exclusively determine part quality, the volumetric energy density is a useful guide in deciding process parameters for thermoelectric materials, and the optimal value is between 9 and 11 J/mm3for Bi2Te3. We demonstrate successful fabrication of different freeform geometries of Bi2Te3powders. The results suggest it is possible to extend this method more broadly to other semiconductor materials, including thermoelectric power generation materials applicable for space applications.